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Summary of Contents for Edwards AIM-P-NW25
- Page 1 D14643880 Issue L Instruction Manual Active Inverted Magnetron Gauge Description Item Number AIM-P-NW25 D14643000 AIM-PL-NW25 D14646000 Original Instructions...
- Page 2 Declaration of Conformity Edwards Ltd, Innovation Drive, Burgess Hill, West Sussex, RH15 9TW, UK The following product Active Inverted Magnetron Gauges AIM-P-NW25 D14643000 AIM-PL-NW25 D14646000 Is in conformity with the relevant requirements of European CE legislation: 2014/30/EU Electromagnetic compatibility (EMC) directive...
- Page 3 Meaning This product contains hazardous substances in at least one of the homogeneous materials used which are above the limit requirement in D14643000 AIM-P-NW25 GB/T 26572 as detailed in the declaration D14646000 AIM-PL-NW25 table below. These parts can safely be used for the environmental protection use period as indicated.
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Page 5: Table Of Contents
Return the equipment or components for service..............19 Spares and accessories ................. 21 Introduction ......................21 Accessories and spares ....................21 7.2.1 Active gauge cables ....................21 7.2.2 Gauge spares ......................22 Appendix A1 ..................... 23 © Edwards Limited 2020. All rights reserved. Page i... - Page 6 Table Page Calibration table for dry air and nitrogen ................12 Trademark credits Edwards and the Edwards logo are trademarks of Edwards Limited, Innovation Drive, Burgess Hill, West Sussex, RH15 9TW, UK. Page ii © Edwards Limited 2020. All rights reserved.
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Page 7: Introduction
The Active Inverted Magnetron (AIM) gauge is a cold cathode ionisation gauge. The pressure is measured indirectly as a function of the current flowing in a Townsend discharge maintained within the body tube. There are two gauge variants, AIM-P-NW25 and AIM-PL-NW25. The body tube of the gauges terminate in an NW25 flange. - Page 8 D14643880 Issue L Figure 1 - General view of AIM gauge showing NW25 flange Page 2 © Edwards Limited 2020. All rights reserved.
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Page 9: Technical Data
Maximum operating altitude 2000 m (indoor use only) Pollution degree Enclosure rating IP40 and IP403 Complete gauge attached to vacuum system. Electronic interface Socket connection (See Appendix FCC68/RJ45 Type, 8 way © Edwards Limited 2020. All rights reserved. Page 3... -
Page 10: Electrical Supply
The external relay must not exceed these ratings. 2.10 Read set-point Output voltage: Settable range < 1.8 to 10.0 V 10 mV Accuracy Minimum load 200 k 50 A Maximum current source Page 4 © Edwards Limited 2020. All rights reserved. -
Page 11: Error Monitoring
D14643880 Issue L 2.11 Error monitoring When a gauge error is detected the set-point is turned off. Error conditions During gauge power up 0.5 s Signal voltage low < 1.8 V © Edwards Limited 2020. All rights reserved. Page 5... - Page 12 D14643880 Issue L This page has been intentionally left blank. Page 6 © Edwards Limited 2020. All rights reserved.
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Page 13: Installation
Connect the gauge before switching ON. Pin 7 must be connected to 0 V to enable the high voltage supply as shown in Figure 2. (The Edwards Active Pirani Gauge can be used to enable the gauge at the correct pressure by suitable connection of its set-point output). © Edwards Limited 2020. All rights reserved. -
Page 14: Gauge Set-Point
C. Voltmeter or chart recorder 3. Signal output 4. Set-point trip level D. Grounding switch E. External DC relay 5. Signal common F. Back EMF suppression diode 6. Set-point output 7. Gauge enable Page 8 © Edwards Limited 2020. All rights reserved. -
Page 15: Set-Point Output
1 amp surge rating and have a minimum reverse voltage rating of 100 volts (e.g. 1N4002 diode). © Edwards Limited 2020. All rights reserved. Page 9... -
Page 16: Disable Set-Point
If the set-point trip level is set to > 9.5 V then the set-point may not switch off when the pressure rises since the hysteresis point will be > 10.0 V. It would then only switch off when the gauge is disabled. Page 10 © Edwards Limited 2020. All rights reserved. -
Page 17: Operation
CAUTION Do not operate Active Inverted Magnetron gauges above an ambient temperature of +60 °C. © Edwards Limited 2020. All rights reserved. Page 11... -
Page 18: Reading The Pressure
1.3 x 10 2.0 x 10 7.60 1.5 x 10 2.4 x 10 7.80 1.8 x 10 2.9 x 10 8.00 2.2 x 10 3.5 x 10 8.20 2.6 x 10 Page 12 © Edwards Limited 2020. All rights reserved. - Page 19 2.5 x 10 6.7 x 10 9.60 5.0 x 10 1.7 x 10 9.80 1.3 x 10 3.6 x 10 9.90 2.7 x 10 1.0 x 10 10.00 7.5 x 10 © Edwards Limited 2020. All rights reserved. Page 13...
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Page 21: Maintenance
After soaking the parts should be thoroughly rinsed in clean water and then in methanol to remove all traces of water. The parts should be dried thoroughly. © Edwards Limited 2020. All rights reserved. Page 15... -
Page 22: Fault Finding
The user should check for correct connections (Section 4) and ensure that the power supply voltage is in the range 13.5 - 36 Vd.c. positive and that pin 7 is connected to 0 V (see Figure Page 16 © Edwards Limited 2020. All rights reserved. - Page 23 A. Bayonet fitting B. Magnet housing C. End cap 5. Body tube 1. Magnet housing 2. Collar 6. Cathode plate 3. Anode assembly 7. Cathode tube 4. Fluoro-elastomer O-ring 8. Circlip © Edwards Limited 2020. All rights reserved. Page 17...
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Page 25: Storage And Disposal
Dispose of the AIM Gauge and any components safely in accordance with all local and national safety and environmental requirements. Alternatively, you may be able to recycle the AIM Gauge and/or cables; contact Edwards or your supplier for advice (also see below). - Page 26 D14643880 Issue L This page has been intentionally left blank. Page 20 © Edwards Limited 2020. All rights reserved.
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Page 27: Spares And Accessories
Service Engineers who have undergone comprehensive Edwards training courses. When you maintain this Edwards product, we recommend you use only Edwards maintenance and service kits. Order spare parts and accessories from your nearest Edwards company or distributor. When ordering, please state... -
Page 28: Gauge Spares
Electronics + magnet housing AIM-P D14643800 Electronics + magnet housing AIM-PL D14646800 Complete body tube assy D14545801 Electrode kit: D14545802 Cathode plate Cathode tube Circlip Fluoro-elastomer O-ring Anode assy Collar Collar spanner Page 22 © Edwards Limited 2020. All rights reserved. -
Page 29: Appendix A1
View of gauge socket (See also Figure A1 inset): Pin allocation Function Power supply positive voltage Power supply common Gauge output signal Set-point trip level Signal common Set-point output Gauge enable No connection © Edwards Limited 2020. All rights reserved. Page 23... - Page 30 D14643880 Issue L This page has been intentionally left blank. Page 24 © Edwards Limited 2020. All rights reserved.
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